Chemical erosion of atomically dispersed doped hydrocarbon layers by deuterium

M. Balden; J. Roth; E. D.J. De Juan Pardo; A. Wiltner

doi:10.1016/S0022-3115(02)01342-9

Chemical erosion of atomically dispersed doped hydrocarbon layers by deuterium

M. Balden, J. Roth, E. D.J. De Juan Pardo, A. Wiltner

Research output: Contribution to journal › Conference article › peer-review

13 Citations (Scopus)

Abstract

The chemical erosion of atomically dispersed Ti-doped (∼10 at.%) amorphous hydrocarbon layers (a-C:H:Ti) was investigated in the temperature range of 300-800 K for 30 eV deuterium impact. Compared to pyrolytic graphite, the methane production yield is strongly reduced at elevated temperatures. This reduction starts from temperatures just above room temperature and is even larger than for B-doped graphite. The reduction of the activation energy for hydrogen release may be the dominant interpretation for the decreased hydrocarbon formation. The ratio of emitted CD₃ to CD₄ increases with temperature for pyrolytic graphite and even stronger for the doped layers. The fluence dependence of the chemical erosion yield was determined, which is explained by enrichment of the dopant due to the preferential erosion of C.

Original language	English
Pages (from-to)	348-353
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	313-316
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/S0022-3115(02)01342-9
Publication status	Published - 1 Mar 2003
Externally published	Yes
Event	International Conference on Plasma Surface Interactions in Controlled Fusion Devices - Gifu, Japan Duration: 26 May 2002 → 31 May 2002

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@article{6759c0e6bbec4886818fea1d2125b885,

title = "Chemical erosion of atomically dispersed doped hydrocarbon layers by deuterium",

abstract = "The chemical erosion of atomically dispersed Ti-doped (∼10 at.%) amorphous hydrocarbon layers (a-C:H:Ti) was investigated in the temperature range of 300-800 K for 30 eV deuterium impact. Compared to pyrolytic graphite, the methane production yield is strongly reduced at elevated temperatures. This reduction starts from temperatures just above room temperature and is even larger than for B-doped graphite. The reduction of the activation energy for hydrogen release may be the dominant interpretation for the decreased hydrocarbon formation. The ratio of emitted CD3 to CD4 increases with temperature for pyrolytic graphite and even stronger for the doped layers. The fluence dependence of the chemical erosion yield was determined, which is explained by enrichment of the dopant due to the preferential erosion of C.",

keywords = "Carbon, Chemical erosion, Doping, Hydrogen, Plasma-wall interaction",

author = "M. Balden and J. Roth and {De Juan Pardo}, {E. D.J.} and A. Wiltner",

year = "2003",

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doi = "10.1016/S0022-3115(02)01342-9",

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volume = "313-316",

pages = "348--353",

journal = "Journal of Nuclear Materials",

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publisher = "Elsevier",

number = "SUPPL.",

note = "International Conference on Plasma Surface Interactions in Controlled Fusion Devices ; Conference date: 26-05-2002 Through 31-05-2002",

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TY - JOUR

T1 - Chemical erosion of atomically dispersed doped hydrocarbon layers by deuterium

AU - Balden, M.

AU - Roth, J.

AU - De Juan Pardo, E. D.J.

AU - Wiltner, A.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - The chemical erosion of atomically dispersed Ti-doped (∼10 at.%) amorphous hydrocarbon layers (a-C:H:Ti) was investigated in the temperature range of 300-800 K for 30 eV deuterium impact. Compared to pyrolytic graphite, the methane production yield is strongly reduced at elevated temperatures. This reduction starts from temperatures just above room temperature and is even larger than for B-doped graphite. The reduction of the activation energy for hydrogen release may be the dominant interpretation for the decreased hydrocarbon formation. The ratio of emitted CD3 to CD4 increases with temperature for pyrolytic graphite and even stronger for the doped layers. The fluence dependence of the chemical erosion yield was determined, which is explained by enrichment of the dopant due to the preferential erosion of C.

AB - The chemical erosion of atomically dispersed Ti-doped (∼10 at.%) amorphous hydrocarbon layers (a-C:H:Ti) was investigated in the temperature range of 300-800 K for 30 eV deuterium impact. Compared to pyrolytic graphite, the methane production yield is strongly reduced at elevated temperatures. This reduction starts from temperatures just above room temperature and is even larger than for B-doped graphite. The reduction of the activation energy for hydrogen release may be the dominant interpretation for the decreased hydrocarbon formation. The ratio of emitted CD3 to CD4 increases with temperature for pyrolytic graphite and even stronger for the doped layers. The fluence dependence of the chemical erosion yield was determined, which is explained by enrichment of the dopant due to the preferential erosion of C.

KW - Carbon

KW - Chemical erosion

KW - Doping

KW - Hydrogen

KW - Plasma-wall interaction

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U2 - 10.1016/S0022-3115(02)01342-9

DO - 10.1016/S0022-3115(02)01342-9

M3 - Conference article

AN - SCOPUS:0037346785

SN - 0022-3115

VL - 313-316

SP - 348

EP - 353

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL.

T2 - International Conference on Plasma Surface Interactions in Controlled Fusion Devices

Y2 - 26 May 2002 through 31 May 2002

ER -

Chemical erosion of atomically dispersed doped hydrocarbon layers by deuterium

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